FIG. 6.

Identification of p-coumaroyl-CoA as a true inducer of the hca genes. Cultures were grown on succinate with the addition of compounds as noted. Not shown because they would compress the uninduced bars are results for strain ADP8114 grown in the presence of 10⁻⁴ M p-coumarate (1,160 Miller units of LacZ activity). Promoter activity was measured, and the averages of three independent trials are presented with their standard deviations.